Don’t just throw these in the bottom of your bag.Don’t leave these in a hot car; sunglasses in the heat for too long will melt.Salt water and other chemicals don’t mix, so please don’t test the theory.Don’t wear them on top of your head as it weakens the joints and misshapes the frame.Don’t use clothing or coarse materials to clean the lenses, use microfiber material or hot water and a tissue to clean the lens.